February saw considerable growth in the use of Cascading Style Sheets (CSS) that contain partial data for script downloaders, a new method for spreading malware that makes it much harder for antivirus solutions to detect malicious scripts. Trojan-Downloader. HTMLAgent.sl took 1st place, while Exploit.JS.StyleSheeter.b came in at 13th place and Trojan.JSAgent.bte at 19th place. February saw the discovery of a number of new malicious programs for the Android platform. February in figures were compiled using data from computers running Kaspersky Lab products.”]
Source: https://securelist.com/monthly-malware-statistics-february-2011/36349/